Re: Mummies
@kretorrbwly Is this sim already some kind of occult, or pregnant? If so, that's why she didn't transform. Try again with a human sim that isn't pregnant.
I haven't heard that time travel can produce mummies. What I've read is that there's a way to cure the mummy's curse through time travel, but you clearly aren't interested in that outcome.
If you have Supernatural installed, probably the easiest way to create a mummy is to make or buy the related elixir. Otherwise, you can collect the five canopic jars and put them in the cursed sarcophagus, and a mummy should emerge. These need to be the special relics, e.g. Canopic Jar of the Cat, not the standard ones that sit in a stack of normal relics like bowls and vases.